Trainerize is a great program with wonderful functionality but it does not do nutrition. You can design your workouts, set basic templates, track exercise progress, body progress, take progress pictures, etc.
There is a program called Dotfit that will do workouts as well as Nutrition but I find it’s limited because you can’t save workout templates or share them between clients.. meaning you have to build from scratch each time and the way the exercises are done, that takes time. You could have it build the workouts then modify them.
Both have their benefits.